Describe the bug
The tutorial of triangle says to use filament.js from unpkg.com.
https://google.github.io/filament/webgl/tutorial_triangle.html
<script src="//unpkg.com/filament/filament.js"></script>
However, I think that version of filament.js is not the latest.
If you use that version, an error will be output to the browser console.
filament.js:6
Uncaught (in promise) TypeError: Incorrect number of tuple elements for Box: expected=2, actual=undefined
at Object.toWireType (filament.js:6)
at RenderableManager$Builder$boundingBox [as boundingBox] (eval at new_ (filament.js:6), <anonymous>:8:26)
at new App ((index):100)
at Object.onReady ((index):136)
at filament.js:6
at filament.js:6
To Reproduce
OK : Using filaments.js on github
https://jsfiddle.net/cx20/o46zbxq8/

NG : Using filaments.js on unpkg.com
https://jsfiddle.net/cx20/dfwpnkxm/

Expected behavior
It was assumed that a blue triangle would be displayed.
Desktop (please complete the following information):
Right, we need to update the npm package. Will do.
Okay, we've updated the npm package. Note that you will need to recompile all materials with the latest version of matc (which is why the jsfiddle is still broken)
I confirmed that the sample in jsfiddle is displayed by recompiling the material file with matc.
OK : Using filaments.js on unpkg.com
https://jsfiddle.net/cx20/dfwpnkxm/

Currently, the latest version of Filament is v1.9.0, but the version of unpkg.com seems to remain v1.8.1.
@cx20 I just pushed v1.9.0, apologies for the delay.